Equipment for evaluating bearing capacity of pipeline through wheel pressure method load test

Abstract

The invention relates to equipment for evaluating the bearing capacity of a pipeline through a wheel pressure method load test. The equipment comprises a datum beam, a counter-force frame and a plurality of wheel set pairs, the wheel set pair comprises two wheel sets which are symmetrically arranged relative to the axis of the reaction frame; the wheel set pair is mounted on the outer side of the counter-force frame through pressurizing equipment; the reference beam is provided with an independent support; and a plurality of displacement monitoring sensors are arranged between the inner wall of the test pipeline and the datum line beam. According to the equipment for evaluating the bearing capacity of the pipeline through the wheel pressure method load test, different mechanical properties of the pipe wall can be tested through asynchronous loads of a plurality of wheel sets, and the internal and external pressure bearing capacity resistance of the pipeline can be better reflected. The equipment has the characteristics of wheel sets, can be loaded and can move quickly, and a quicker method is provided for tests. Advance measurement can be carried out under a fixed pressure load condition; and after a plurality of load cycles, a certain step length can be carried out for measurement.

Description

Technical Field

[0001] The present invention relates to an equipment for evaluating the bearing capacity of pipelines by the wheel pressure method load test, and belongs to the technical field of high-pressure water pipeline detection and evaluation. Background Art

[0002] At present, there are two types of internal pressure bearing capacity tests for pipelines, both of which are tested on a test bench and cannot be carried out on-site, which is a very big shortcoming. They are respectively: (1) lining a steel pipe with sufficient stiffness on the test bench and then sealing and pressurizing. The inner lining steel pipe is 20 cm smaller in diameter than the test pipe; (2) Another test is to apply the 3-point loading method on the test platform to reflect the performance of the pipeline concrete, prestressed steel wires and the water pressure resistance performance through the bending performance of the pipeline. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a device that can be tested in-situ at the engineering site.

[0004] In order to solve the above technical problem, the technical solution proposed by the present invention is: an equipment for evaluating the bearing capacity of pipelines by the wheel pressure method load test, including: a reference beam, a reaction frame and a number of wheel pairs; the wheel pairs include two wheel groups arranged axially symmetrically with respect to the center of the reaction frame; the wheel pairs are installed outside the reaction frame through a pressurizing device; the reaction frame can be arranged in the test pipeline, the wheels contact the inner wall of the test pipeline, and the pressurizing device can push the wheel pairs to apply pressure to the inner wall of the test pipeline; the reference beam has an independent support; a number of displacement monitoring sensors are installed between the inner wall of the test pipeline and the reference beam.

[0005] A further improvement of the above solution is that: one of the wheel groups in the wheel pair is installed on the reaction frame through the pressurizing device, and the other wheel group is directly installed on the reaction frame.

[0006] A further improvement of the above solution is that: both of the wheel groups in the wheel pair are installed on the reaction frame through the pressurizing device.

[0007] A further improvement of the above solution is that: the reaction frame extends with a number of brackets, and traveling wheels are installed on the brackets; the reaction frame can move along the test pipeline through the traveling wheels.

[0008] A further improvement of the above solution is that: the anti-pressurizing device is a flat jack.

[0009] In order to solve the above technical problem, another technical solution proposed by the present invention is: a method for using the above equipment for evaluating the bearing capacity of pipelines by the wheel pressure method load test, including the following steps: (1) After wire break detection and appearance inspection, select the pipe fittings that need to be tested and evaluated to determine the safe water conveyance pressure of the water transmission pipeline; (2) During the water cut-off period, transport the equipment for evaluating the pipe bearing capacity by the wheel pressure method, the monitoring instruments, sensors and acquisition instruments for the test to the test site; (3) Design the loading scheme according to the wire break detection data; theoretically calculate the load-displacement and load-strain process curves; (4) Formulate the loading mechanism, including loading levels, the magnitude of each load level, the duration. According to the theoretical and measured responses and the time process trend, design the load, analyze whether to continue loading, and analyze the bearing capacity of the pipe fittings; analyze the state of the structure as elastic or plastic according to the residual displacement and strain before and after loading and unloading; (5) After testing one point, move the equipment and then conduct another point test. Each point can be tested more than 3 times, and one pipe fitting can be tested at more than 3 points; (6) Comprehensively evaluate the pipe fittings by integrating the wire break detection data, appearance inspection data, material performance data, and loading test data; (7) After testing and analyzing multiple representative pipe fittings and measuring points, evaluate the capacity of the entire pipeline, and put forward operation suggestions and maintenance suggestions. A further improvement of the above solution is that: several brackets extend from the reaction frame, and walking wheels are installed on the brackets; the reaction frame can move along the test pipeline through the walking wheels.

[0010] The equipment for evaluating the pipe bearing capacity by the wheel pressure method provided by the present invention can test different mechanical properties of the pipe wall through asynchronous loading of multiple wheel groups, and better reflect the anti-internal and external pressure bearing capacity performance of the pipeline; it can also rotate the equipment in the diameter direction of the pipe diameter to conduct tests on different measuring points to obtain more information. This equipment has the characteristics of wheel groups, can be loaded simultaneously, and can move quickly, providing a faster method for the test. It can move forward for measurement under fixed pressure load conditions; it can also move forward a certain step length after multiple load cycles for measurement. Brief Description of the Drawings

[0011] The present invention will be further described below with reference to the accompanying drawings.

[0012] Figure 1 is a schematic structural diagram of a preferred Embodiment 1 of the present invention.

[0013] Figure 2 is a schematic side view structural diagram of a preferred Embodiment 1 of the present invention.

[0014] Figure 3 is a schematic side view structural diagram of a preferred Embodiment 2 of the present invention.

[0015] Figure 4It is a schematic side view structure diagram of a preferred embodiment 3 of the present invention. Detailed implementation manners

[0016] Embodiment 1: The equipment for evaluating the bearing capacity of a pipeline by the wheel pressure method in this Embodiment 1, as Figure 1 and Figure 2 shown, includes: a reaction frame 1 and several pairs of wheel groups; each pair of wheel groups includes two wheel groups 2 arranged axially symmetrically with respect to the axis of the reaction frame 1; the pair of wheel groups is installed on the outer side of the reaction frame 1 through a pressurizing device 5; the reaction frame 1 can be arranged in the test pipeline 4, the wheel groups 4 contact the inner wall of the test pipeline 4, and the pressurizing device 5 can push the pair of wheel groups to apply pressure to the inner wall of the test pipeline 4; the reference beam 4 has an independent support structure, and this support structure spans the test section of the test pipeline 3 to provide support for the reference beam 4, thereby avoiding the change in the position of the reference beam 4 caused by strain. In this way, the position of the reference beam 4 is stable during the test. Several displacement monitoring sensors 5 are arranged between the inner wall of the test pipeline and the reference beam, and are used to measure the deformation data of the inner wall of the test pipeline 3 during the test.

[0017] In this embodiment, the pressurizing device 5 uses a flat jack, and the reaction frame 1 is in a circular ring shape, and the space in the middle can accommodate equipment and personnel.

[0018] The usage method of the equipment for evaluating the bearing capacity of a pipeline by the wheel pressure method in this Embodiment 1 includes the following steps: (1) After wire breakage detection and appearance inspection, select the pipe fittings that need to be tested and evaluated to determine the safe water conveyance pressure of the water conveyance pipeline; (2) During the water cut-off period, transport the equipment for evaluating the bearing capacity of a pipeline by the wheel pressure method, the monitoring instruments, sensors and acquisition instruments for the test to the test site; (3) According to the wire breakage detection data, design the loading load scheme; theoretically calculate the load-displacement and load-strain process curves; (4) Formulate the loading mechanism, including the loading level, the magnitude of each level of load, the duration, and according to the theoretical and measured responses and the time process trend, design the load, analyze whether to continue loading, and analyze the bearing capacity of the pipe fittings; according to the residual displacement and strain before and after loading and unloading, analyze the state of the structure as elastic or plastic; (5) After testing one point, move the equipment and then carry out the test at another point. Each point can be tested more than 3 times, and one pipe fitting can be tested at more than 3 points; (6) Comprehensively evaluate the pipe fittings by integrating the wire breakage detection data, appearance inspection data, material performance data, and loading test data; (7) After testing and analyzing multiple representative pipe fittings and measuring points, evaluate the overall pipeline capacity, and put forward operation suggestions and maintenance suggestions. A further improvement of the above solution is that several brackets extend from the reaction frame 1, and walking wheels are installed on the brackets; the reaction frame 1 can move along the test pipeline through the walking wheels.

[0019] Embodiment 2: The equipment for evaluating the bearing capacity of a pipeline by the wheel pressure method in this Embodiment 2 is an improvement based on Embodiment 1. Most of it is the same as Embodiment 1, and the different parts are as Figure 3 shown.

[0020] One of the wheel groups in the wheel pair is installed on the reaction frame 1 through a pressurizing device, and the other wheel group is directly installed on the reaction frame 1. Considering that the action of force is mutual, when one side of the wheel pair is pressurized, an equal reaction force will inevitably be generated on the other side. Such a setting will cause the reaction frame 1 to displace, so its use method needs to be restricted and can be used only when testing two opposite positions.

[0021] Embodiment 3: The equipment for evaluating the bearing capacity of a pipeline by the wheel pressure method in this Embodiment 3 is an improvement based on Embodiment 1. Most of it is the same as Embodiment 1, and the different parts are as Figure 4 shown.

[0022] Several brackets extend from the reaction frame 1, and walking wheels are installed on the brackets; the reaction frame 1 can move along the test pipeline 4 through the walking wheels. With such a setting, the walking structure is separated, which can avoid vibration and impact on the pressurizing device 5 during walking.

[0023] The above embodiments are all based on the wheel group pressurization method. During the loading and unloading process, the displacements and strains of the deformation control points of the pipeline are measured, and combined with the finite element theoretical model of the limited influence range of pressurization in a limited area, the internal water pressure bearing capacity of the pipeline is evaluated. Through the wheel group, the deformation test of the key positions in the test pipeline can be carried out, which is more targeted than the overall pressurization method.

[0024] The present invention is not limited to the specific technical solutions described in the above embodiments. In addition to the above embodiments, the present invention can also have other implementation manners. Any technical solution formed by equivalent replacement falls within the protection scope required by the present invention.

Claims

1. An equipment for evaluating the bearing capacity of pipelines by wheel pressure method load test, characterized in that, Comprising: A reference beam, a reaction frame, and a number of wheel pairs; each wheel pair includes two wheels arranged symmetrically about the axis of the reaction frame; The wheel pairs are installed on the outside of the reaction frame through a pressurizing device; the reaction frame can be arranged in the test pipeline, the wheels contact the inner wall of the test pipeline, and the pressurizing device can push the wheel pairs to apply pressure to the inner wall of the test pipeline; the reference beam has an independent support; a number of displacement monitoring sensors are installed between the inner wall of the test pipeline and the reference beam.

2. The equipment for evaluating the bearing capacity of pipelines by the wheel pressure method load test according to claim 1, characterized in that: One wheel in the wheel pair is installed on the reaction frame through the pressurizing device, and the other wheel is directly installed on the reaction frame.

3. The equipment for evaluating the bearing capacity of a pipeline by a wheel pressure method load test according to claim 1, characterized in that: Both wheels in the wheel pair are installed on the reaction frame through the pressurizing device.

4. The equipment for evaluating the bearing capacity of pipelines by the wheel pressure method load test according to claim 1, characterized in that: A number of brackets extend from the reaction frame, and walking wheels are installed on the brackets; the reaction frame can move along the test pipeline through the walking wheels.

5. The equipment for evaluating the bearing capacity of pipelines by the wheel pressure method load test according to claim 1, wherein: The anti-pressurizing device is a flat jack.

6. The method of using the equipment for evaluating the bearing capacity of pipelines by the wheel pressure method load test according to claim 1, characterized in that, Including the following steps: (1) After wire breakage detection and appearance inspection, select the pipe fittings that need to be tested and evaluated to determine the safe water conveyance pressure of the water conveyance pipeline; (2) During the water cut-off period, transport the equipment for evaluating the bearing capacity of the pipeline by the wheel pressure method, the monitoring instruments, sensors and acquisition instruments for the test to the test site; (3) Design the loading load scheme according to the wire breakage detection data; theoretically calculate the load-displacement and load-strain process curves; (4) Formulate the loading mechanism, including loading levels, the magnitude of each load level, the duration, design the load according to the theoretical and measured responses, the time process trend, analyze whether to continue loading, and analyze the bearing capacity of the pipe fittings; analyze the state of the structure as elastic or plastic according to the residual displacement and strain before and after loading and unloading; (5) After testing one point, move the equipment and then conduct another point test. Each point can be tested more than 3 times, and one pipe fitting can be tested at more than 3 points; (6) Comprehensively evaluate the pipe fittings by integrating the wire breakage detection data, appearance inspection data, material performance data, and loading test data; (7) After testing and analyzing a number of representative pipe fittings and measuring points, evaluate the capacity of the entire pipeline and put forward operation suggestions and maintenance suggestions.

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